SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b33d18e0048098f32809a368d9bc2c1720c61225bf71b843e862483560aefe2' 
  AND token = 'YvaLTovJdx6CTmim/EgYVzhuXFzHF9FQTWRKq10prp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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