SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc1b1cc65c752a0f102c53a4f5ce5c668036078f62ef9b5fbc5e8d2338a9ead7' 
  AND token = 'meDmIjWBqiPUiNuF1zQ9lV4AEY6xu1YXNmR0/ZK+qSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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