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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55e28f6f2dad3fd05b2d0b23ce647c28f28735e61f63f3723af8b3cb27491ed5' 
  AND token = 'AwBtvxt0FjDyKcVit9BklF71fa1J9biMiUGrRl7yruI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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