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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86ca868438c61fb27ad48987dcc4d4036eb0b8b614ce19c0c84ea74f2a1cb762' 
  AND token = 'UKu5gJBK93+xoy7l7X3IavA8LKdYcPOA8evihOjgLek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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