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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3bd0ec0676fcc81c84aa0b63b93fbf0e17d84cf8e4e0bd47ae5aec1d530c276' 
  AND token = 'L2HBLYjpLa6CUEIT2zboFucr2HTqZT+rkHBNnGjcu3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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