SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '348747cf898ce9bfea37232fbedf76259fc9ddab95401eae65085b31a70138d3' 
  AND token = 'kAGPo7Z27lgsgb03HLKRSDFjq0BpgJ8jkhEOKmfwJS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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