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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5f73ec5a5fccfa8e9ca8059d11ac2eb7195a07f042cf139fe9896fa20bfe2ec' 
  AND token = 'b55rzOeEfnl5ZBRgY3mGc7GN2LD8PmzHKWj1arW7oPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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