SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '825cf8b9f1dcf3d452a5a142084a77c7861216db6b8dfc78aa3f73d16d8b1506' 
  AND token = 'vFPK5z2vHn1VVgfCWlZPlNoVbuXTf4c8L0GdqRIJ7J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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