SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27c0e9f0c0a1665b32adc5987c93a412518e922a59ef979ff47cf32734b65ec8' 
  AND token = 'r3qvX+z12zIwV+NE47MqFVmT1EIUqqZYGl4ehlLP5UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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