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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '436555ceecfc68aa8f3125ab7c3925e21328a83d5df13b55c36dc3003b94c316' 
  AND token = 'YAbSg668+n5Od98K4L+35P8dThqglxreAoh/tY6HaJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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