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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '383939810834bd4bfc580537d88833121d08413d60000cf4a51eb81eb1157892' 
  AND token = 'BDzWVNEFEzV0tDuP9r3OaUelgj5LeWUQqpHILoWRgTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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