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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1e01988725d819d3992b463339630e215daf554f117371fb84547f1953c92e5' 
  AND token = 'Rl+TW+w+aXWK/OE87qxzd6unVU55cQjPibdROTA+a88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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