SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f58df37b351290270c3c66d0a8b82833ac2fabbe0fe2fd3bbb2797f25616e500' 
  AND token = 'Vlxl9s/8LUYVGi98CEXvoZlFEdmMsTjOyJvM4yq2enA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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