SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9898eafc7f2f98d142a41fa3a59689c7c97fa6cbe2086ccfd0b280a03cde3dbd' 
  AND token = 'q9KLK8MpPf4PVJnhmzQDY+j6nWKeSC+r0zv9toLfEZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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