SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '132636d95ae4814a85d6da18bfa5d99eeb4dab1016277684fd676b0c0d1ac145' 
  AND token = 'KvGSi+FMPRyg1wKroBq3qUqLgQJWXTvbIhmEfRPED1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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