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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '392569ddef60cd2fed30f4ca77e8a66fa5e246ea26fc8516138646152825cec8' 
  AND token = 'H7oaZR20/qmBjDaSqg2EBhfhvaGMmUFq0o2P90L2LEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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