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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f37b32358bf584231d4a9ea5f96e8506b1eb0f8b3463a9677a5f37b61ee21f2c' 
  AND token = 'wKvDbdP65ejbn+3d+7A97A9QABxq5vO3m2/nfYByRrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}