SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4862461583bac176f3e3e03e2841b2240827a3f669c0e4d1a679b19002c9402e' 
  AND token = 'qoZmagZilQgV86gIJcIb02Ck/gGTnxYSFoDaS+WZK9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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