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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bff72f2183aee46150f2c0cc80a6f65b8096d778ae7d12464c8c629ff743368b' 
  AND token = 'grl6fcmrxJ8Dero5cUnShsh+vvzP9k9Wa8Vgb6W1TS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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