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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2476699c5768ca79e863d812e9293a8c615f9006666753cd629968b3dc0aa7f3' 
  AND token = 'M0Hm6/jGAlJpe3IulqZz/XJytuyLF75YPSw/JTcOFec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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