SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '448a1b93880ea0c6e1731b7fcf0dd0c5ce5dbd246d10c4c318b58e21c29fcd7f' 
  AND token = 'HMxZ+Gmyo/3PCYnJKv9LBsOIhmXf5ZRvx4D1vb+/U8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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