SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '514d53b104eec052ba3b404a3e6b9910c75a4cc590f1988b3b0d26a6f35949a6' 
  AND token = 'WcVYx/dDe0gBGtsdK4Tg+B7eLueMpNzXsJwuJwjZbrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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