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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75520119f120197eb7d4c9080218f00fcb877435232a8b0716e2ca21022e531e' 
  AND token = 'ieYHdnrUhdE6C0liyxiiBu9KYJojROl3HwjjF3Zev7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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