SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abd80697d677ba1e2583565aaf71e8e53e2db76b6403e538e1d4af312461790b' 
  AND token = 'bxrWBAHWjFz+lL9PLD+IRAyEwKxZ7AJ48n+1Q+MU4RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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