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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18af2e55e3e179b3fbf71cc48be2bf8193bf8d6a41e20edf03e3bdecc6a93d97' 
  AND token = 'a8Setkd5Gzm96JZ4/888PUUGS/MwBUmUD1yhmqSmbsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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