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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1bba4bb0cfc6932ffed96bbebc68835872b3d2f9fe21364ecfbccd7b3fadf6a' 
  AND token = '4z5AcVOJYceUt5/eiQtdmp6yh4ukK6D2rW8YaZgFzqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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