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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a96fb24cac8b3b98f131f33810f435cceb16f9bcaf76e4112f1b1781ad0bf9ba' 
  AND token = 'RSA7XVS7FykBeoxLZCgL6oHoOdMnRUw1zQ47URjozFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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