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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40b97e6c5d6a0d14da74d53c1c95162a8b8635881716e4fb758bc44854b51a8c' 
  AND token = 'uVXtLG+UnNyUv8S+0ZEEYIGyusG0Jw+dwYh5Esm786M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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