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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b49e6f3a439d45d5286dcdecb17e72ecbeddd371bccc672f4ae74ae70d05ced' 
  AND token = 'FDB/O6aWT9NECH0bGdE9idzM6J+6iJWZKGGhigDD744=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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