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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31335cdcba97981e110d2ced37f8170543c5be25641555879fd8cc1a718372cc' 
  AND token = 'iRV12oDl4ytGc3apgr1yd52bcaWyx6XN5hGrKIjIH8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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