SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3532c15cac04f14b9bc55c39082b1b6c025ef5939d12f8f6a3354b98532a5c6' 
  AND token = 'gZwlQqG3LHOD65AYJIwgp1Qs+gwV2ZZNFlzsbhlX+Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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