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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '942b80e469fb22193eb80360fd72cb17c86ab66e78026ed1c3dee1fb5dd4c8c7' 
  AND token = 'DixuYT3ayRmddYtdoaeVlVY/U7fZ/QCBDtfiV4ZFFLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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