SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28e34e113c00a11358531df7f0293ca659b0e60f2aa7b938f7c96c1d48840b08' 
  AND token = 'Zhyh2fOabQVQWZh7Ul/DX2X9BdC5XJsVO+b9EsVSLHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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