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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '863fcd89b461fea1f8accf44b15e53cb414c82db1699be42146befadc49c84b1' 
  AND token = 'pYxh6WbiVX3ORPJ4TqbQNDqui/KfVKdvEkqspw5cGpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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