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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad0d8dd4f5128b0329b547c7bdfaf2f26b32060f1e33bec6a6fa7d1f4a95242f' 
  AND token = 'Db29CoI2O1SC6xqLJUfnIvOfaBZ6PjJfANUr5aMAbMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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