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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3675ee29d76fdb9003907c88bf12cc91a079bcfd6ed772a9813eea4b741cc783' 
  AND token = 'Hy6bu8IXfZUq1dUaPenddYTwE/97a89A5heEIiN4B0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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