SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70ec7621a4ecfbe405ace1b8bab97014fe5b32df82062d84219da9b22917fd39' 
  AND token = '6eCK/zsJZK8IWW7V3hh0Bv/cNqa58oBTcV9ZQEDWVOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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