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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '474002ed2c5f86d8b17a83553f931c0631f364b9ef125b205e38ece757b3daa0' 
  AND token = '9G5pnAjdkfkV4FZRKoh1DLi0WanWDLuYeaucKL8OX0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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