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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd59c6ee1947985d60dc1696f4d35778b17a7f1c17294f58da3b26f1e84d0789' 
  AND token = 'r7QFKfFEtAFMfPc7e47iRwc2sO0WdI9henrWZ8SCVFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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