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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcce4a7eb54d8758313d47011dc1c1aea125be5c7cd83bfc68417b5ffd4edcc7' 
  AND token = '/PJHBty0KNsQZwywI+U46j4QXNvwBA+KPxT2NHOto5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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