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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a1e33d22ab7a279884ccb5757da4b44f93dbea69920b4a4cb693d67eaaa8f28' 
  AND token = 'YTtTjkpqic7kGdKZqEu4vv0+acUtvo+du9URg4wm9RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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