SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae2db9fed8ca1601389544cd481dc5e5ed787ee266d671a471259f085d57341f' 
  AND token = '/G2bnzQSYXJb/rdfEXbWk8/jUHnjKVGRtUcgj2gKy28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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