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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a619dfd515d07288e6e917aa43a333ebaf7de36ddcf92c5f13fa7f5ecd59b25b' 
  AND token = 'XHBOkouJPyqd6kVOHX5SguTmEBiPALck7ROQk+Hqgv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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