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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42548976569b410b2c1f662c1460ee6736da0d31a4b4ace0718120e815a98393' 
  AND token = 'hJNspvsA57wocZg1FqE0iumHbTMt6R6r63TJW0doj7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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