SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5182c97064ade6f0b5cbdf90cbc627afacea41e3489084715d66a6211be2033d' 
  AND token = 'KnLlMBS17pLYquvaCTN5Bwqt/P1HFF96FC5FsUVxK/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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