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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92f1de5a99c965be4cb64b1ab740aebb5561a6ef3e0e338aadcfe71698d46c23' 
  AND token = '0ZrO3UWOeoZFpZlvt4N10ZVzTh6evZznosRCDBB8mZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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