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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a79fc051289988ef9042383bac7ab21b53de29ac89ae5cfe09e219e093563107' 
  AND token = 'Amk7F6DpeobqGDwEZj4rxthiziYb8lknG35dOwt3Pi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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