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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '333b50d34c595d664898690889583e77e83609a11c72795aa4a34c946b115c59' 
  AND token = 'klm95poo2yQ+YEgjAk2SIt/U0elhgu4Cjyat6ilOIgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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