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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f9ebe7d7ec436904a3b111ed08dc8acd8006b0fe962ae3a5212dc6d5c6bb3c8' 
  AND token = 'S1413YhuR3O/I6v36KeRu67iYaM96ssDy8WHLHrwP3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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