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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc4b711503a64dfbb8a89519034b071cd3add5eb36b59d6a773745dea0d9c010' 
  AND token = '9CyksnZZLSLD7AB64t7khIaVDbIpH7rsdBzF4sDXcZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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