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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '172f0b0805f4885fcf8a245a0e39bcd3800db88214cf28273446fd9c858adb38' 
  AND token = 'jgMQbdgHw6nblII4t87vEDDYSYT0j/bFlt5MTrh1ads=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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