SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2966fce41ff8eed274ccfc84fb11fe6a51e02ac759e5adc177f8b83c023309d0' 
  AND token = 'hskwFG+V3yS3axBsfTlMOgPlrXvMYlBbhD9JGHlNhVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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