SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72cf27a9e1623749e28288ff630a5d45d2a147577d9a3475938bab131169a9c5' 
  AND token = 'chAAeZKSmYBwvHf6XP0/HmZqZ7qeUULmoSmxBl9Bvow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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