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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '848a3c5e7ea29faad77e511b601054fe31a78da05c4196130a6aaa9d088f85f1' 
  AND token = 'hDVEFevzpIr+Ge9vT9oTteIbxgjBaSux17hwv0LYKt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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