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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cbaa0a94704e15491b13e3723eeae77efdc57be6b419aeee254b85f2ae6fbcb' 
  AND token = 'KAulyB33XtF1ctM31bM8AcMow10iZpJKf+6cfqbkyIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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