SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e55efef1ace6d87560390e655b7612d43d875cc4637795636b18ce519d1bc29' 
  AND token = 'FpQpbOS4xGF6qY9pR8zbv9As+LQhPguWp0hhuWAXDF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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