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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2acbc355cbb2582f6e09d8141194b5debcd4793640e807eb9bfd22ce1e173b7' 
  AND token = 'E4alwWgS7VfgATU75eD5neTjMuNCkZMAWRWpSB/HrxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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